During the early and mid 1970s KEF was the first company to utilise computers in the design and analysis of loudspeakers. The design process that flowed from this was termed ‘Total System Design’ where the final performance of the speaker was seen as the combination of drivers, cabinet and crossover all working together to produce the target acoustic response, with computers being used throughout for simulations and analysis. The Corelli, Calinda and Cantata represented the first application of this methodology in the mid priced sector.

Corelli was an 8 inch two-way closed box system that built on the success of the Chorale. The developments included a new version of the B200 bass unit and an improved cabinet. Calinda was an 8 inch two-way system with an auxiliary (passive) radiator augmenting the low frequency response. This format was used previously in the Cadenza and Reference 104. In the Calinda system the driver layout was adjusted to allow an elegantly slim floor standing cabinet. Cantata was a three way closed box design using the famous B139 ‘racetrack’ bass driver, a new version of the B110 bass/midrange unit and the new T52 tweeter - the latest development of the proven T15. In the Cantata system the driver layout allowed a slim frontal aspect ratio, demonstrating how acoustical and industrial design was developing through the 1970s.